Answer:
1.
Required rate = risk free rate + beta (market rate – risk free rate)
.12 = 0.0525 + 1.25(X – 0.0525)
1.25X – 0.065625 = .12 – 0.0525
1.25X = 0.0675 + 0.065625
X = .1333125/1.25
= 0.1065
Marker risk premium = market rate – risk free rate
= .1065 – 0.0525
= 0.054 (A)
2.
Beta of portfolio = (5000000/5500000)* 1.25 + (500000/5500000)* 1
= 0.90909* 1.25 + 0.090909* 1
= 1.136 + 0.090909
= 1.2273
3.
Required rate = risk free rate + beta (market rate – risk free rate)
= 0.0525 + 1.2273* 0.054
= 0.0525 + 0.06627
= .11877 or 11.88%